Telephone hand set



NOV. 3, 1931 .1. Lox-:FFLER 1,830,035

TELEPHONE HAND S ET Filed July ll, 1930 Fi .1. .'g

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UNITED STATES PATENT OFFICE LOUIS J'. LOEFFLER, OF STAPLETON, NEW YORKTELEPHONE HAND SET Application led July 11, 1930. Serial No. 467,272.

r1`his invention relates essentially to a tele- The tubular casing 7 isprovided with the phone hand set of that type in which the usual talkingor transmitting unit l2 and a handle carries the receiver andtransmitter diaphragm 13 fixed to the unit. A circular opposite to eachother so that it can be conmouth member ll made of hai-il rubber with 5veniently held to the mouth and the message a circular depression 15eccen ric with the 55 received by one of the ears of a'person. peripheryof' the member is located adjacent An object of the invention is toprovide the diaphragm. lVithin the depression sunk a. method of mountingthe electro magnets below the top is a series of slots 1(3,conm1uniofthe receiving unit in a tubular casing eating with the cavity 1T of themember la formed at one end of the handle. which is substantiallyelliptic as indicated 60 Another object of the invention is to proinFig. l. In this device the sound waves vide means whereby the receivinorunit can pass through the slots and strike against the be removed fromthe casing so lttliat it can elliptic 'inner surface of the mouth piecebe inspected and any defects in the connecthereby scattering the soundmolecules in thetions readily repaired. cavity over a wide area.The-depression is 65 Another object of the invention is to prolocated atan angle to the diaphragm so that `vide a mouth member at thetransmitting the full volume o t the sound waves passing end of thecasing whereby the volume of through the slots strike the diaphragm atan sound is intensified by striking against an angle and rebound againstthe elliptic surelliptic shaped cavity formed in the mouth face givingresonancy. The member 1i is 70 member. clamped to the casing by aflanged ring 1S Another object. of the invention is to prohavinginterior threaded portions to engage vide the handle with a rectangularcompartthe exterior threads' at the end of the tubular ment suitable formounting the switches casing. The usual line circuit connections 19thereon controlling the circuit for the receivare shown leading to thetransmitting and 75 ing and transmitting devices. receiving unit asindicated in Fig. l.

The novel features of the invention are The receiving devices include acircular more fully described in the following speciperforated earmember 2O having a rim 2l fication and claims and illustrated in theaewhereby it is clamped fast by means of a companying drawings in which:flanged interior threaded ring Q2 screwed 80 Fig. 1 represents avertical sect-ion of a' onto the exterior threads at the end of thedevice embodying this invention. tubular casing. A diaphragm 24 isplaced Fig. 2 is a horizontal section along the line on the rim. In theinterior of the casing is 2-2 of Fig. l. arranged a supporting annularmember or Fig. 3 is a similar section taken along the thimble havingoutwardly projecting annu- 85 line 3--3 of the same. lar base flange 25and an inwardly extending Fig. 4 is a vertical sect-ion along the lineannular upper flange :26 with a central open* 4 4 of Fig. 1. ing, theflange 25 at the base of the thimble Fig. 5 is an inverted plan vieW ofthe transis forced against the end of the casing by the mitter. ring Q2thus clamping the thimble member 90 In the drawings is shown a handle 6prefto the casing. A pair of bobbins or electro erably made of hardrubber'and having conmagnets 26 are located in the central opentiguoustubular casings 7 and 8 respectively ing ot the thimble and each has acoil of wire located at each end of the handle. In the 27 wound thereonwith terminals 2S at times handle is located a rectangular compartmentconnected to the transmitter. Each bobbin 95 9 closed by a countersunkplate 9 arranged is provided with a soft iron core or pole memat thebottom of the handle. The plate has ber 29 having its upper end bent atright movably mounted thereon push buttons 10 angles as indicated inFig. l. The pole memand 11 the object of which will be hereinafter beris secured to the flange 26 by means of described. rivet or bolt' 30passed through an eye in 1n the pole member and the flange. In the spacebetween the flange and the pole member is arranged a segmental bushingor Washer 3l to give rigidity to the connecting parts A key 32connecting both poles fastens the bobbin to the poles or cores.

The means for closing the circuit of the transmitter and receiver iscontrolled by the said push button l() arranged in the bottom of thehandle. In the compartment 9 is fixed a frame 33 by means of screws 34which also secure the plate 9 for closingr the compartment. Springcontact blades 35 are fixed to a block $36 secured in the frame. Theblades are actuated by the push button l0 thereby closing the circuitleading to the transmitting and receiving units. Spring contact blades3T secured to the block 3G controlled by the button ll close a circuit3S connected to a buzzer at a distant station. The wi re electricalconnections between the contact blades, the transmitter and receiver areof the usual kind.

I claim:

l. A telephone hand set comprising` a tu` bular casing', a perforatedear member secured to the bottom of the easing, a diaphragm located onthel ear member. a receiving unit arranged in the casing, said unitincluding a thimble provided with flanged upper and base portion,electro magnets fastened to the upper flange, and a ring member engagingthe casing and ear member made to jam the base flange of the thimbleagainst the bottom of the casing.

Q, A telephone hand set comprising a tubular casing, having a threadedend, a circular perforated ear member having a rim positioned at thebottom of the casing, a diaphragm located on the rim, a receiving unitarranged in the tubular casing7 said unit includinga thimble with anout\ 'ardly projecting base flange and an inwardly extending top flange,electro magnets secured to the top flange, and an interiorly threadedring mem ber engaging the threaded end of the casing to liam the baseflange of the thimble against the bottom of the casing, said ring havinga flange at its lower end to engage the rim of the ear member.

3. A telephone hand set comprising a tnbular casing having a threadedend, a eircu lar perforated ear member having a rim positioned at thebottom of the casing, a dia phragm located on the rim, a receiving unitarranged in the tubular casing, said unit including a thimble withoutwardly projecting base flange and inwardly extending top flange,electro magnets located above the diaphragm in the casing, pole memberssecured to the top flange, and an interiorlyk threaded ring memberengaging the threaded end of the casing to jam the base flange of thethimble against the bottom of the casing, said ring having a flange atits lower end to engage the rim of the ear member.

4. A telephone hand set comprising a tubular casing having a threadedend, a circular perforated ear member having a rim positioned at thebottom of the casing, a diaphragm located on the rim, a receiving unitarranged in the tubular casing, said unit including a thimble withoutwardly projecting base flange and inwardly extending top flange,electro magnets located above the diaphragm in the casing, pole membersriveted to the top flange, a key for fixing the magnets to the polemembers, and an interiorly threaded ring member engaging the threadedend of the casing to jam the base flange of the thimble against thebottom of the casing, said ring having a flange at its lower end toengage the rim of the ear member.

In a telephone hand set the combination with a handle having a tubularcasing at each end with a receiving and transmitting unit respectivelyarranged therein, a rectangular compartment located in the handle, aplate to close the compartment, a frame secured in the compartment,Contact switch blades fastened to the frame, blade connections betweenthe transmitting, receiving and a distant audible unit, and a pair ofpush buttons mounted on the plate for actuating the blades to close thecircuits of the respective units.

In testimony whereof I have hereunto set my hand.

LOUIS J. LOEFFLER.

